A lot of us are reddit refugees that used Sync as our primary way of interacting with content. For those people (like me), Sync for Lemmy is the easiest transition from Reddit Sync, with all the controls and customization we got used to over time. I didn't even bother with Lemmy on mobile because the Fediverse multi-site experience kinda sucks and would rather have a more familiar and user-friendly experience. Maybe I'll explore other options in the future but the ad-supported free option is really not a problem for me right now.